An initializer is an object that runs during Arbortext PE Request Manager startup. Initializers prime cache managers, allocate resources, and otherwise set the stage for request processing. There are two kinds of initializers, blocking and deferred. Blocking initializers run during startup, after all other components have been initialized but before the Arbortext PE Request Manager starts accepting client requests. Deferred initializers run after the Arbortext PE Request Manager starts accepting client requests.